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50
51#include "mainwindow.h"
52#include "diagramscene.h"
53#include "diagramitem.h"
54#include "commands.h"
55
56#include <QAction>
57#include <QGraphicsView>
58#include <QMenu>
59#include <QMenuBar>
60#include <QMessageBox>
61#include <QUndoView>
62
63//! [0]
64MainWindow::MainWindow()
65{
66 undoStack = new QUndoStack(this);
67
68 createActions();
69 createMenus();
70
71 createUndoView();
72
73 diagramScene = new DiagramScene();
74 QBrush pixmapBrush(QPixmap(":/images/cross.png").scaled(w: 30, h: 30));
75 diagramScene->setBackgroundBrush(pixmapBrush);
76 diagramScene->setSceneRect(QRect(0, 0, 500, 500));
77
78 connect(sender: diagramScene, signal: &DiagramScene::itemMoved,
79 receiver: this, slot: &MainWindow::itemMoved);
80
81 setWindowTitle("Undo Framework");
82 QGraphicsView *view = new QGraphicsView(diagramScene);
83 setCentralWidget(view);
84 resize(w: 700, h: 500);
85}
86//! [0]
87
88//! [1]
89void MainWindow::createUndoView()
90{
91 undoView = new QUndoView(undoStack);
92 undoView->setWindowTitle(tr(s: "Command List"));
93 undoView->show();
94 undoView->setAttribute(Qt::WA_QuitOnClose, on: false);
95}
96//! [1]
97
98//! [2]
99void MainWindow::createActions()
100{
101 deleteAction = new QAction(tr(s: "&Delete Item"), this);
102 deleteAction->setShortcut(tr(s: "Del"));
103 connect(sender: deleteAction, signal: &QAction::triggered, receiver: this, slot: &MainWindow::deleteItem);
104//! [2] //! [3]
105
106//! [3] //! [4]
107 addBoxAction = new QAction(tr(s: "Add &Box"), this);
108//! [4]
109 addBoxAction->setShortcut(tr(s: "Ctrl+O"));
110 connect(sender: addBoxAction, signal: &QAction::triggered, receiver: this, slot: &MainWindow::addBox);
111
112 addTriangleAction = new QAction(tr(s: "Add &Triangle"), this);
113 addTriangleAction->setShortcut(tr(s: "Ctrl+T"));
114 connect(sender: addTriangleAction, signal: &QAction::triggered, receiver: this, slot: &MainWindow::addTriangle);
115
116//! [5]
117 undoAction = undoStack->createUndoAction(parent: this, prefix: tr(s: "&Undo"));
118 undoAction->setShortcuts(QKeySequence::Undo);
119
120 redoAction = undoStack->createRedoAction(parent: this, prefix: tr(s: "&Redo"));
121 redoAction->setShortcuts(QKeySequence::Redo);
122//! [5]
123
124 exitAction = new QAction(tr(s: "E&xit"), this);
125 exitAction->setShortcuts(QKeySequence::Quit);
126 connect(sender: exitAction, signal: &QAction::triggered, receiver: this, slot: &QWidget::close);
127
128 aboutAction = new QAction(tr(s: "&About"), this);
129 QList<QKeySequence> aboutShortcuts;
130 aboutShortcuts << tr(s: "Ctrl+A") << tr(s: "Ctrl+B");
131 aboutAction->setShortcuts(aboutShortcuts);
132 connect(sender: aboutAction, signal: &QAction::triggered, receiver: this, slot: &MainWindow::about);
133}
134
135//! [6]
136void MainWindow::createMenus()
137{
138//! [6]
139 fileMenu = menuBar()->addMenu(title: tr(s: "&File"));
140 fileMenu->addAction(action: exitAction);
141
142//! [7]
143 editMenu = menuBar()->addMenu(title: tr(s: "&Edit"));
144 editMenu->addAction(action: undoAction);
145 editMenu->addAction(action: redoAction);
146 editMenu->addSeparator();
147 editMenu->addAction(action: deleteAction);
148 connect(sender: editMenu, signal: &QMenu::aboutToShow,
149 receiver: this, slot: &MainWindow::itemMenuAboutToShow);
150 connect(sender: editMenu, signal: &QMenu::aboutToHide,
151 receiver: this, slot: &MainWindow::itemMenuAboutToHide);
152
153//! [7]
154 itemMenu = menuBar()->addMenu(title: tr(s: "&Item"));
155 itemMenu->addAction(action: addBoxAction);
156 itemMenu->addAction(action: addTriangleAction);
157
158 helpMenu = menuBar()->addMenu(title: tr(s: "&About"));
159 helpMenu->addAction(action: aboutAction);
160//! [8]
161}
162//! [8]
163
164//! [9]
165void MainWindow::itemMoved(DiagramItem *movedItem,
166 const QPointF &oldPosition)
167{
168 undoStack->push(cmd: new MoveCommand(movedItem, oldPosition));
169}
170//! [9]
171
172//! [10]
173void MainWindow::deleteItem()
174{
175 if (diagramScene->selectedItems().isEmpty())
176 return;
177
178 QUndoCommand *deleteCommand = new DeleteCommand(diagramScene);
179 undoStack->push(cmd: deleteCommand);
180}
181//! [10]
182
183//! [11]
184void MainWindow::itemMenuAboutToHide()
185{
186 deleteAction->setEnabled(true);
187}
188//! [11]
189
190//! [12]
191void MainWindow::itemMenuAboutToShow()
192{
193 deleteAction->setEnabled(!diagramScene->selectedItems().isEmpty());
194}
195//! [12]
196
197//! [13]
198void MainWindow::addBox()
199{
200 QUndoCommand *addCommand = new AddCommand(DiagramItem::Box, diagramScene);
201 undoStack->push(cmd: addCommand);
202}
203//! [13]
204
205//! [14]
206void MainWindow::addTriangle()
207{
208 QUndoCommand *addCommand = new AddCommand(DiagramItem::Triangle,
209 diagramScene);
210 undoStack->push(cmd: addCommand);
211}
212//! [14]
213
214//! [15]
215void MainWindow::about()
216{
217 QMessageBox::about(parent: this, title: tr(s: "About Undo"),
218 text: tr(s: "The <b>Undo</b> example demonstrates how to "
219 "use Qt's undo framework."));
220}
221//! [15]
222

source code of qtbase/examples/widgets/tools/undoframework/mainwindow.cpp